55017747115421 has 6 divisors (see below), whose sum is σ = 58444458008730. Its totient is φ = 51781409049536.

The previous prime is 55017747115399. The next prime is 55017747115427. The reversal of 55017747115421 is 12451174771055.

It is a happy number.

55017747115421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 5383044979321 + 49634702136100 = 2320139^2 + 7045190^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55017747115421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55017747115421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55017747115427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95186413406 + ... + 95186413983.

It is an arithmetic number, because the mean of its divisors is an integer number (9740743001455).

Almost surely, 2^{55017747115421} is an apocalyptic number.

It is an amenable number.

55017747115421 is a deficient number, since it is larger than the sum of its proper divisors (3426710893309).

55017747115421 is a wasteful number, since it uses less digits than its factorization.

55017747115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190372827423 (or 190372827406 counting only the distinct ones).

The product of its (nonzero) digits is 1372000, while the sum is 50.

The spelling of 55017747115421 in words is "fifty-five trillion, seventeen billion, seven hundred forty-seven million, one hundred fifteen thousand, four hundred twenty-one".